Flores was 0-1 with a 6.14 ERA in the 1997 Intercontinental Cup; only Jose Quiroz had a worse ERA on Nicaragua's staff. At age 34, he was the oldest member of the team. He gave up 4 runs (one earned) in six innings in a loss to Panama in the 1999 Pan American Games. In the 2001 Baseball World Cup, the old-timer was 1-0 with a 1.23 ERA as one of the top Nicaraguan performers. He returned to the national team for the 2006 COPABE Olympic Qualifiers, going 0-1 with seven hits and six runs (four earned) in four innings at age 43.

Through 2007, the durable southpaw led the Nicaraguan amateur league in career starts (351), wins (157), losses (119) and walks (660) and was second in innings (2,107 and strikeouts (1,278). He was still active at age 48 with Chinandega, older than a couple of their coaches. The next-oldest performer was 35-year-old Oswaldo Mairena.